The instrument is factory calibrated with the supplied microphone for the reference environmental conditions
(see Appendix C). The microphone sensitivity is a function of the temperature, ambient pressure and
humidity, and when the absolute sound pressure level value is required, the absolute calibration of the
measurement channel should be performed.
4.1 PREPARATION FOR CALIBRATION
If the SV 200A instrument is assembled and needs calibration, it is necessary to disassemble following parts
of SV 200A:
• con nozzle,
• SA 209 foam windscreen,
• extension sleeve,
• microphone protective sleeve.
To access the microphone, do what
follows:
1. Push the foam windscreen until you
see the lateral hole.
2. Insert the 3 mm Allen key into the
hole.
3. Holding the Allen key and the
extension sleeve in one hand to keep
them still, use the other hand to
unscrew the top cone with the anti-
bird spikes, rotating it counter-
clockwise.
hold the Allen key
firmly in one hand
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